On the night of june 9th, 2017 at around 11:30 pm, i was home and in bed when one of the dogs decided he needed to go outside, so i got up and took him out to the back yard. the sky was clear and as usual, i paused to gaze at the stars. i looked straight up and immediately saw some kind of light moving just above a 60' tree behind me. as i watched, 3 lights in the shape of an equilateral triangle came into full view directly above me. the lights were bright, white, and steady — although they seemed to have a shimmering quality to them. my first thought was that someone was flying a drone over our house, but it seemed a bit late at night, and i’ve never seen drones in our neighborhood. then it occurred to me that it made no sound — it was totally silent. i remember thinking that it all seemed very odd. if it was a drone, flying possibly only 60-70 feet above me, i should have easily heard the buzzing sound of the motors/rotors. i felt a sense of awe; although it was also slightly disorienting since i couldn’t tell how large the formation was, what the elevation was or the actual speed. i watched the lights move at what seemed like a consistent speed, in a straight south-easterly direction. it only took about 10-12 seconds until they were out of sight. i live outside the city lights in a dark suburban area, on top of a hill, above the tree line so i had a clear view during the entire observation. i’ve never witnessed anything like this, and felt the need to report it. an active local astronomer suggested that it could have been a triad of spy satellites. i do enjoy watching satellites and the iss (watched iss go over just last night 7-22-2017) but the lights i observed seemed brighter and closer than satellites i've seen.